Fix requirement for node20 for checkout

[sbryngelson]

Trying to fix error with GH self-hosted Phoenix runner seen here: https://github.com/MFlowCode/MFC/actions/runs/9794226632/job/27043820008

Run actions/checkout@v3
  with:
    repository: MFlowCode/MFC
    token: ***
    ssh-strict: true
    persist-credentials: true
    clean: true
    sparse-checkout-cone-mode: true
    fetch-depth: [1](https://github.com/MFlowCode/MFC/actions/runs/9794226632/job/27043820008#step:2:1)
    fetch-tags: false
    lfs: false
    submodules: false
    set-safe-directory: true
/storage/scratch1/6/sbryngelson3/runners/actions-runner-1/externals/node[2](https://github.com/MFlowCode/MFC/actions/runs/9794226632/job/27043820008#step:2:2)0/bin/node: /lib64/libm.so.6: version `GLIBC_2.27' not found (required by /storage/scratch1/6/sbryngelson[3](https://github.com/MFlowCode/MFC/actions/runs/9794226632/job/27043820008#step:2:3)/runners/actions-runner-1/externals/node20/bin/node)
/storage/scratch1/6/sbryngelson3/runners/actions-runner-1/externals/node20/bin/node: /lib6[4](https://github.com/MFlowCode/MFC/actions/runs/9794226632/job/27043820008#step:2:4)/libc.so.6: version `GLIBC_2.28' not found (required by /storage/scratch1/6/sbryngelson3/runners/actions-runner-1/externals/node20/bin/node)
/storage/scratch1/6/sbryngelson3/runners/actions-runner-1/externals/node20/bin/node: /lib64/libc.so.6: version `GLIBC_2.2[5](https://github.com/MFlowCode/MFC/actions/runs/9794226632/job/27043820008#step:2:5)' not found (required by /storage/scratch1/[6](https://github.com/MFlowCode/MFC/actions/runs/9794226632/job/27043820008#step:2:6)/sbryngelson3/runners/actions-runner-1/externals/node20/bin/node)

[sbryngelson]

started failing with pr #502 when GH enforced node20 by default, this seems like it will fix it (for now).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.37%. Comparing base (e1d5179) to head (f42f65a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #505   +/-   ##
=======================================
  Coverage   58.37%   58.37%           
=======================================
  Files          57       57           
  Lines       14440    14440           
  Branches     1892     1892           
=======================================
  Hits         8429     8429           
  Misses       5449     5449           
  Partials      562      562           

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